<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">

      <div class="title-container">
        <h3 class="title">Login Form</h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="loginForm.username"
          placeholder="Username"
          name="username"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="Password"
          name="password"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
        </span>
      </el-form-item>

      <el-row :gutter="10">
        <el-col :span="18">
          <el-form-item prop="validCodeInput">
            <span class="svg-container">
              <svg-icon icon-class="form" />
            </span>
            <el-input
              ref="validCodeInput"
              v-model="loginForm.validCodeInput"
              placeholder="Valid Code"
              name="validCodeInput"
              tabindex="2"
              auto-complete="on"
            />
          </el-form-item>
        </el-col>
        <el-col :span="6">
          <valid-code ref="validCode" @update:value="updateValidCode" />
        </el-col>
      </el-row>

      <el-button :loading="loading" type="primary" style="width:100%;margin-bottom:30px;" @click.native.prevent="handleLogin">Login</el-button>

      <div class="tips">
        <span style="margin-right:20px;">username: admin</span>
        <span> password: any</span>
      </div>

    </el-form>
  </div>
</template>

<script>
import { validUsername } from '@/utils/validate'
import ValidCode from '@/components/ValidCode'

export default {
  name: 'Login',
  components: { ValidCode },
  data() {
    const validateUsername = (rule, value, callback) => {
      if (!validUsername(value)) {
        callback(new Error('Please enter the correct user name'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 6) {
        callback(new Error('The password can not be less than 6 digits'))
      } else {
        callback()
      }
    }
    const validateValidCode = (rule, value, callback) => {
      // 输入值和图像中的值都转换成大小后再比较，达到忽略大小写的效果
      if (value === '' || value.toUpperCase() !== this.validCode.toUpperCase()) {
        // 触发点击事件修改验证码
        this.$refs.validCode.$el.click()
        callback(new Error('Please enter the correct valid code'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        username: 'admin',
        password: '111111',
        validCodeInput: ''
      },
      loginRules: {
        username: [{ required: true, trigger: 'blur', validator: validateUsername }],
        password: [{ required: true, trigger: 'blur', validator: validatePassword }],
        validCodeInput: [{ required: true, trigger: 'blur', validator: validateValidCode }]
      },
      loading: false,
      passwordType: 'password',
      redirect: undefined,
      validCode: ''
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  methods: {
    showPwd() {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          this.$store.dispatch('user/login', this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || '/' })
            this.loading = false
          }).catch(() => {
            this.loading = false
          })
        } else {
          console.log('error submit!!')
          return false
        }
      })
    },
    updateValidCode(value) {
      this.validCode = value
    }
  }
}
</script>

<style>
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

@supports (-webkit-mask: none) and (not (cater-color: #fff)) {
  .login-container .el-input input {
    color: #fff;
  }
}
/* reset element-ui css */
.login-container .el-input {
  display: inline-block;
  height: 47px;
  width: 85%;
}
.login-container .el-input input {
  background: transparent;
  border: 0px;
  -webkit-appearance: none;
  border-radius: 0px;
  padding: 12px 5px 12px 15px;
  color: #fff;
  height: 47px;
  caret-color: #fff;
}
.login-container .el-input input:-webkit-autofill {
  box-shadow: 0 0 0px 1000px #283443 inset !important;
  -webkit-text-fill-color: #fff !important;
}
.login-container .el-form-item {
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  color: #454545;
}
.login-container .el-form-item:focus-within {
  border:1px solid rgba(76,190,255,1);
}
</style>

<style scoped>
.login-container {
  min-height: 100%;
  width: 100%;
  background-color: #2d3a4b;
  overflow: hidden;
}
.login-container .login-form {
  position: relative;
  width: 520px;
  max-width: 100%;
  padding: 160px 35px 0;
  margin: 0 auto;
  overflow: hidden;
}
.login-container .tips {
  font-size: 14px;
  color: #fff;
  margin-bottom: 10px;
}
.login-container .tips span:first-of-type {
  margin-right: 16px;
}
.login-container .svg-container {
  padding: 6px 5px 6px 15px;
  color: #889aa4;
  vertical-align: middle;
  width: 30px;
  display: inline-block;
}
.login-container .title-container {
  position: relative;
}
.login-container .title-container .title {
  font-size: 26px;
  color: #eee;
  margin: 0px auto 40px auto;
  text-align: center;
  font-weight: bold;
}
.login-container .show-pwd {
  position: absolute;
  right: 10px;
  top: 7px;
  font-size: 16px;
  color: #889aa4;
  cursor: pointer;
  user-select: none;
}
</style>
